How To Remove pattern Lock/ User Lock videocon a15 hard reset

First Backup Your All Data And Remove sim Card And Memory Card.

1. Press And Hold Volume Down + Power Key

2. Show Android Recovery logo Tap the home key Than Show Recovery Menu.

3. Use Volume Down Key To Select Wipe data/factory reset and press Menu key to confirm. 

4. Select This option Yes -- Delete all user data Again Press Menu key

5. Now Select Reboot System Now wait few second

Done.